543945561 has 16 divisors (see below), whose sum is σ = 781209600. Its totient is φ = 335673360.

The previous prime is 543945559. The next prime is 543945581. The reversal of 543945561 is 165549345.

It is not a de Polignac number, because 543945561 - 2¹ = 543945559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (543945541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125011 + ... + 129288.

It is an arithmetic number, because the mean of its divisors is an integer number (48825600).

Almost surely, 2^543945561 is an apocalyptic number.

It is an amenable number.

543945561 is a deficient number, since it is larger than the sum of its proper divisors (237264039).

543945561 is a wasteful number, since it uses less digits than its factorization.

543945561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254356.

The product of its digits is 324000, while the sum is 42.

The square root of 543945561 is about 23322.6405237486. The cubic root of 543945561 is about 816.3037889332.

The spelling of 543945561 in words is "five hundred forty-three million, nine hundred forty-five thousand, five hundred sixty-one".